Review an OCaml API

I want to meet up and talk about ocaml. It can be a code cafe, or I/someone can prepare something more formal. Here are some ideas, open to others:

1. containers, sequence, and gen
   https://github.com/c-cube/ocaml-containers
   https://github.com/c-cube/gen
   https://github.com/c-cube/sequence
   A compelling alternative to batteries, core, or stdlib
   by Simon Cruanes.

2. riakc_ppx
   https://github.com/struktured/riakc_ppx
   type safe caching api over riakc (authored by me)

3. gpr
   https://github.com/mmottl/gpr
   gaussian process regression by Markus Mottl

(4) spoc
http://mathiasbourgoin.github.io/SPOC/
GPU programming toolkit
(5) ocaml-prob-cache
https://github.com/struktured/ocaml-prob-cache
probability caching api (authored by me)